From 8bcddbcce2fa9eaa2e2e1ee2bb469189f76b7cbd Mon Sep 17 00:00:00 2001
From: Sami Mujawar <sami.mujawar@arm.com>
Date: Thu, 18 May 2023 11:00:54 +0100
Subject: ArmPkg: Adjust variable type and cast for RegShift & RegOffset

According to the GIC architecture version 3 and 4 specification, the
maximum number of INTID bits supported in the CPU interface is 24.

Considering this the RegShift variable is not required to be more than 8
bits. Therefore, make the RegShift variable type to UINT8.  Also add
necessary typecasts when calculating the RegOffset and RegShift values.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
---
 ArmPkg/Drivers/ArmGic/ArmGicLib.c         | 24 ++++++++++++------------
 ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c |  6 +++---
 2 files changed, 15 insertions(+), 15 deletions(-)

(limited to 'ArmPkg/Drivers')

diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
index 0127cca3bf..8f3315d76f 100644
--- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
+++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
@@ -228,13 +228,13 @@ ArmGicSetInterruptPriority (
   )
 {
   UINT32                 RegOffset;
-  UINTN                  RegShift;
+  UINT8                  RegShift;
   ARM_GIC_ARCH_REVISION  Revision;
   UINTN                  GicCpuRedistributorBase;
 
   // Calculate register offset and bit position
-  RegOffset = Source / 4;
-  RegShift  = (Source % 4) * 8;
+  RegOffset = (UINT32)(Source / 4);
+  RegShift  = (UINT8)((Source % 4) * 8);
 
   Revision = ArmGicGetSupportedArchRevision ();
   if ((Revision == ARM_GIC_ARCH_REVISION_2) ||
@@ -272,13 +272,13 @@ ArmGicEnableInterrupt (
   )
 {
   UINT32                 RegOffset;
-  UINTN                  RegShift;
+  UINT8                  RegShift;
   ARM_GIC_ARCH_REVISION  Revision;
   UINTN                  GicCpuRedistributorBase;
 
   // Calculate enable register offset and bit position
-  RegOffset = Source / 32;
-  RegShift  = Source % 32;
+  RegOffset = (UINT32)(Source / 32);
+  RegShift  = (UINT8)(Source % 32);
 
   Revision = ArmGicGetSupportedArchRevision ();
   if ((Revision == ARM_GIC_ARCH_REVISION_2) ||
@@ -317,13 +317,13 @@ ArmGicDisableInterrupt (
   )
 {
   UINT32                 RegOffset;
-  UINTN                  RegShift;
+  UINT8                  RegShift;
   ARM_GIC_ARCH_REVISION  Revision;
   UINTN                  GicCpuRedistributorBase;
 
   // Calculate enable register offset and bit position
-  RegOffset = Source / 32;
-  RegShift  = Source % 32;
+  RegOffset = (UINT32)(Source / 32);
+  RegShift  = (UINT8)(Source % 32);
 
   Revision = ArmGicGetSupportedArchRevision ();
   if ((Revision == ARM_GIC_ARCH_REVISION_2) ||
@@ -361,14 +361,14 @@ ArmGicIsInterruptEnabled (
   )
 {
   UINT32                 RegOffset;
-  UINTN                  RegShift;
+  UINT8                  RegShift;
   ARM_GIC_ARCH_REVISION  Revision;
   UINTN                  GicCpuRedistributorBase;
   UINT32                 Interrupts;
 
   // Calculate enable register offset and bit position
-  RegOffset = Source / 32;
-  RegShift  = Source % 32;
+  RegOffset = (UINT32)(Source / 32);
+  RegShift  = (UINT8)(Source % 32);
 
   Revision = ArmGicGetSupportedArchRevision ();
   if ((Revision == ARM_GIC_ARCH_REVISION_2) ||
diff --git a/ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c b/ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c
index a7970e51b3..cd65cf06d7 100644
--- a/ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c
+++ b/ArmPkg/Drivers/ArmGic/GicV2/ArmGicV2Dxe.c
@@ -393,7 +393,7 @@ GicV2DxeInitialize (
   EFI_STATUS  Status;
   UINTN       Index;
   UINT32      RegOffset;
-  UINTN       RegShift;
+  UINT8       RegShift;
   UINT32      CpuTarget;
 
   // Make sure the Interrupt Controller Protocol is not already installed in
@@ -411,8 +411,8 @@ GicV2DxeInitialize (
     GicV2DisableInterruptSource (&gHardwareInterruptV2Protocol, Index);
 
     // Set Priority
-    RegOffset = Index / 4;
-    RegShift  = (Index % 4) * 8;
+    RegOffset = (UINT32)(Index / 4);
+    RegShift  = (UINT8)((Index % 4) * 8);
     MmioAndThenOr32 (
       mGicDistributorBase + ARM_GIC_ICDIPR + (4 * RegOffset),
       ~(0xff << RegShift),
-- 
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